If you are thinking that scammers have accessed your CS.MONEY account, you should complete those 4 steps in order to protect your account:
Change your Steam password - Go to your account settings and find "Change Password". After that scammers wouldn't be able to use your old data for the authorization. Once scammers have an access to your Steam account, they could easily use your data to authorize on CS.MONEY
Deauthorize all other devices in Steam - Open Steam Guards settings and deauthorize all devices. Now all scammers were logged out from your Steam account
Revoke your Steam Web API Key - Open Steam API page and revoke your key. Most likely scammers will register the API key for the future scams, don't ignore this step. You do not need to create new API key. The domain field should be empty.
Deauthorize all other devices on CS.MONEY - Open CS.MONEY Security settings and deauthorize all devices. Now all scammers were logged out from your CS.MONEY account. If you have finished all of the steps correctly, scammers wouldn't be able to access your CS.MONEY account